Subject: FW: Réf. : Question: Réf. : Echantillons de pièces en alumine pour essais d'isolation électrique. From: "Eva Barbara Holzer" Date: Mon, 22 Aug 2005 15:16:59 +0200 To: "Bernd Dehning" , "Gianfranco Ferioli" >> -----Original Message----- >> From: jjbanquet@sct-ceramics.com [mailto:jjbanquet@sct-ceramics.com] >> Sent: 22 August 2005 07:35 >> To: Eva Barbara Holzer >> Subject: Réf. : Question: Réf. : Echantillons de pièces en >> alumine pour essais d'isolation électrique. >> >> >> Dear Mrs. , >> The material your are testing is our 97% alumina ceramic >> which is given in our material chart with resistivity of >> 10E14 Ohm.cm , it is the same material that we have quoted >> against your tender. >> The holes on the samples are free from firing , no machining >> any has been done after firing ,the holes finish is not very >> critical on the resistivity values measured between two hole >> the more important is that the surface between holes is >> according on the samples ''just fired''. The value of the >> resistivity measured between two holes depend from >> resistivity of material but also from surface resistivity >> which is very depending on atmosphere testing conditions as >> well as eventual pollutions on ceramic surfaces ( handling , >> contact with other parts or products ,...) . The advantage of >> ''just fired'' surfaces is the presence on surface of >> ''sintering skin'' >> which give natural smooth surface aspect due to presence of >> vitreous flux on surface . >> Expecting this response to be satisfactory , however in any >> case do not hesitate to ask me if you have any more questions. >> Best regards. >> Jean Jacques Banquet >> Market Manager >> Tel. Direct : +33(0)562389774 >> Tel. Mobile : +33(0)623064448 >> Fax: +33(0)562334181 >> Visit our Web sites at : >> www.sct-ceramics.com >> www.radiocer.com >> >> >> >> >> >> "Eva Barbara >> >> >> Holzer" Pour : >> >> >> > >> >> ern.ch> Objet : >> Question: Réf. : Echantillons de pièces en alumine pour >> essais d'isolation >> électrique. >> >> >> 19/08/2005 18:04 >> >> >> >> >> >> >> >> >> >> >> >> >> Dear Mr. Banquet, >> >> We are testing one of your samples at the moment. It looks >> very good at the moment. >> >> In my records I noted that it is 97% Alumina with a nominal >> resistivity of >> 10E14 Ohm cm. Could you please confirm that. >> >> Also, could you please tell me whether the holes have been >> machined after firing or not? Has there been any (other) >> machining after firing? If so, in which way would that >> influence the properties of the surface of the sample? >> >> >> Thank you very much in advance! >> >> Best regards, >> Barbara Holzer >> >> -- >> Barbara Holzer barbara.holzer@cern.ch >> CERN/AB/BDI tel.: +41 22 767 29 19 >> CH-1211 Geneva 23 fax: +41 22 767 95 60 >> >> >> >> >> >> >> >> >> >>